Excavating shovel



April 3, 1928. 1*,664,940

I J. W. PAGE 7 EXCAVATING SHOVEL Filed June 14. 1926 J57??? Zd F22 Patented Apr. 3, 1928.

UNITED STATES PATENT OFFICE.

EXCAVATING SHOVEL.

Application filed. June 14, 1926. SerialNo. 115,881.

This invention relates to improvements in excavating shovels and is fully described and explained in this specificatlon and shown" in the accompanying draw1ngs, 1n

6 which-Figure l is a side view of my 11nproved shovel, Fig. 2 is a vertical sectional view of the sheave forming a part of the device, and Fig. 3 is a view taken as 1nd1- cated by the line 3 of Fig. 2.

The excavating shovel herein shown is of the same general type as, and an improve ment on, No. 758,380 dated April 26, 1904, my Patent No. 916,772 dated March 30, 1909, my Pat- 16 out No. 1,532,77 dated April 7, 1925, and my Patent No. 1,491,414 dated April 22, 1924. The particular features of'diflerence between this shovel and the shovels shown in said patents will be particularly pointed out 20 herein.

Referring to the drawings, A indicates chains pivotally attached to the sides of the shovel at their lower ends and having their upper ends fastened to a clevis 10, for the attachment of a cable A by which the shovel can be lifted. The chains A are separated by a spreader-banll, above the shovel to form a sort of bail. v

13. indicates the shovel proper which is pivotally secured to the lower ends of the chains A, the points of connection between the chains A and the shovel being behind the center of gravity of the shovel, so when released the shovel will, swing down and dump its contents as is particularly set forth in Patent No. 758,380 granted April 26,1904, referred to above. Pivotal connections between the lower ends of the'chains A and the shovel are indicated by 13. The front 40 lower'corner of the shovel. is provided with a cutting-edge indicated by b. The sides of the shovel, as indicated by E, project slightly forward of the cutting-edge b. To the front edges of the sides E are fastened eyes 46 15, to which are attached the chains C which perform the same function as the two small hauling-ropes C, of my Patent No. 758,380, and the same function as the hauling-bail C of my Patent No. 916.7 7 2. The hauling 50 chains C are connected at their forward ends 'to the hauling-rope C. I

The block D is attached to the lower end of the lifting cable A, where it is fastened to the clevis 10. Over this block runs a holding rope d, one end of which is secured to the ends of two short holding-chains d the shovels shown in my Patent,

which are secured to the upper forward corners of the sides'E of the shovel. The other end of the holding-rope cl, is fastened to the point of attachment of the hauling-chains C to the main holding-rope C. This shovel differs from the shovels shown in the patents referred to, in the construction, arrangement and operation of the block D and holdingrope d, passing over the same. These parts will be described more in detail hereinafter.

In general, my shovel works the same as the shovel of patents referred to, each one of the parts doing all that is done by the corresponding parts of the shovels of-said patents. Thus, when it is desired to excavate with my shovel, the hauling-rope C can be drawnin by a suitable,engine, and the shovel will fill itself with earth in the ordinary way. Thereupon the shovel can be raised ,by a derrick, if desired, and it will be'maintained'in a horizontal position as long as tension is maintained on the hauling-rope C. held in horizontal position as long as the main hauling-rope C is held taut, the force,

for holding the shovel horizontal passing to it at times through the short haulingchains 0, at other times through-the holding-rope d, and at times through both. The holding-rope 03, keeps the shovel in a horizontal position only when it is kept under tension by the tautness of the hauling-rope 0'. 'As soon as tension on the hauling rope C is released, therefore, regardless of the elevation of the shovel, both means for holding the shovel in a horizontal position are released and its own weight swings it down so as to dump its contents.

It will be noted that when the shovel is to be held in a horizontal position by the holding-rope (Z, said holding-chain must be kept under tension bythe tautness of the hauling-rope C. It is desirable to maintain the requisite tension on the holding-rope d, to keep the shovel horizontal, without unnecessary tautness of the hauling-rope C since too much tautness-on said haulingrope C is likely to swing the shovel out of the desired posltion for dumping. For this reason, it is desirable to provide means whereby a slight tautness of the haulingrope C will maintain sufiicient tension onthe holding-rope d, to keep the shovel in a horizontal position until it is ready'to be dumped. quick, free and complete dumping of the As the shovel is lifted it is However, in order to. permit dumping the shovel.

shovel, the holding-rope (I, should be permitted to run over the'block D freelas The block D is provided with a sheave as shown in Fig. 2. This sheave, instead of having the usual circulangroove for the cable d to run upon, has a poly-sided groove 77', here shown as being three-lobed,.that' is,

havin three flattened sides or faces indicated y 77. Although I have shownthe groove of the sheave as having three flattened faces, it is to be understood that this number may be varied without departing from the spirit of the invention. For example, it could have more than three such flattened surfaces, or could have only oneor.

two. Also, if desired, one or more of the flattened surfaces or faces instead of bein flat, could be substantially flat or curve For example, the curvature of the faces could be elliptical or circular with a longer radius than the normal radius of the sheave. When the shovel is in its horizontalor load-retaining position as shown in- 1, with suflicient tensionon the hauling r0 'C' to hold the shovel in this position, t e

sheave D will be in substantially theposh tion shown in Fig. 2.; When in this position, it will be noted that there-is a leverage.

in favor of the end of the holding-rope (1 attached to the end of the hauling-rope G',;

so that but a slight tautneg on said hauling-rope C will serve to maintain 'sufiicient tension "on the holding-rope d to revent dumping of the shovel; This favora le'lev- 'er'age is due to the position of the sheave as shown in Fig. 2, from which it will be seen, that the two radii to the two tangential junctions of the holding-rope d with the groove are not equal. In Fig. 2, such tangential junction, on the upper side is indi cated by 81, andthe lower by 82. The effective leverage from point 81 isrepresented by the radius 81 and the efiectiveleverage from the point 82 is represented by the radius 82". The radius 81" being longerthan 82, it will be seen that there is a leverage in favor of the end of the rope d attached to the hauling-rope C. By this construction, the operator may have an advantage ofapproximately 1% times in holding the shovel from dumping, over the ordin circular sheave. In operation, when thes ovel is lifted, the sheave naturall rolls until the everage comes in favor of t e haulin -rope, as explained above, and as shownin ig. 2, and the sheave remains in this position until the hauling-rope C is released forduniping.

While I have shown and described certaln embodiments of my invention, it is to be understood that it is capable of man modifications. Changes, therefore, in t e construction and arrangement may "be'made without departing from the spir1t and $00 of theinvention as disclosed'in the appen d ed claims, in' which it is my intention to claim all novelty inherent'in my invention as broadly as powible in view of the prior *art.

by Letters Patent, is:

1. In a device of the class combination with a suitable shovel of an porting means' pivoted thereto behind center of gravity thereof, ha

pivotally secured to the front of the shovel,

What I claim new and to described, the l a block attached to the supportingmeans,

said block having a. sheave with a flattened face, and a holdin rope front of said shoved hauling means.

combination with a suitableshovel, of an s porting: means pivoted 2. In adevice of the class described, "the running from the over said .sheave'to the thereto behind t e center ofgravity thereof, haulin means iv-' otally secured to the front of t e shove a block attached to the supporting means, 'said block having flattened faces, and a 'holding-rope-runnmg .from the front of said shovel over said sheave to the hauling means; I 3. In a device of the claw described, the combination'vvith a suitable shovel, of an a sheave with a plurality of port1ng-means pivoted thereto behind t e' center of-gravity thereof, hauling means pivotally secured to the front of the shovel, a

block attached tothe sup rting means, said block having a; three-lo holding-rope runningfrorn the front ofsaid shovel over said sheave to the hauling means. 4. In a device of the class described, the combination with a suitable shovel, of sup porting means pivoted thereto-behind the .center of gravity thereof, .haulingmeans sheave, and a Ill pivotally secured to the front of the shovel,

a block attached to the supporting means, a sheave in said block, and a holding rope run! in}; from the frontof said shovel over said sheave to the hauling means, said sheave being so' shaped that as said holding-r0 111118 over said sheave, aleverage will established at intervals in favor of the end of said holding-rope attached to said, hauling means;

5. In a device of the this described, the Y combination with a suitable shovel, of supporting means pivoted thereto behind the center of gravity thereof, haulin means pivotally secured to the front of t e shovel, a block attached to the supporting means, a 6 sheave in said block, a holding-rope running fromthe front of said shovel over said sheave 'to the hauling means, and means whereby, as said holding-rope runs over said sheave, a leverage will be established at intervals in favor of the end ofsaid holdingrope 'attached to said hauling means.

6.. A block provided with a sheave having a flattened face for the purpose of increasing the leverage in favor of one end of a rope. passing over said sheave.

7. A block providedwith a sheave having a plurality of flattened faces for the purpose of increasing the leverage in favor of one end of a rope passing over said sheave.

8. A block having a three-lobed sheave for 20 the purpose of increasing the leverage in favor of one end of a rope passing over said sheave.

In testimony whereof. I have hereunto set my hand this 10th day of June,,A. D. 1926.

JOHN W. PAGE. 

